Yes on ipados 18.0 beta 2 this option screen time can not be opened, it just hangs settings app. Sounds like an improvement, as it was crashing badly xD

Here is the bugreport with all the details FB13889619

Here is the bugreport with all the details FB13889619

Here is the bugreport with all the details FB13889619

Here is the bugreport with all the details FB13889619

i Gathered all the crash logs into FB13889619

This is well known issue for iOS 18 https://forums.developer.apple.com/forums/thread/756855

Same here, as this screen time is crashing constantly when I try to access it from settings. I even registered a FB13889619 with all the crash log and sysdiag, and got no single response from apple whatsoever.